I didn't want him to be unhappy or have to deal with it, and so it was me who ended it." 2007 to 2010 These two dated on and off for several years. Online, he ;cheated on her ;with Lindsay Lohan at Cannes.

Amanda admits she ;made a mistake ;with Dominic Cooper, believing he’d leave his then-girlfriend for her. But as recently as February 2012, Amanda told ; Glamour, ;"He was my last real boyfriend.

He made his feature film debut in 1998 in the slasher film Halloween H20: 20 Years Later, followed by teen roles in films such as the sci-fi horror film The Faculty and the drama The Virgin Suicides.

Hartnett had starring roles in the epic war film Pearl Harbor, the drama O, and the war film Black Hawk Down, the romantic comedy 40 Days and 40 Nights, and the mafia thriller Lucky Number Slevin.

but they've known each other for awhile, when they were seeing other people." The new couple is reportedly taking this slow.

costars Thomas Sadoski and Amanda Seyfried started dating in February 2016, and became engaged later that year.

They got married in a secret, private ceremony in March 2017.

Remember when Amanda said her last real boyfriend was Dominic Cooper? For a few months in early 2012 "She's kind of a super clingy girlfriend and he doesn't want that,” a source told ; Us Weekly ;during Amanda Seyfried and Josh Hartnett’s “cooling down” phase.